semidiameter

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sem·i·di·am·e·ter

 (sĕm′ē-dī-ăm′ĭ-tər, sĕm′ī-)
n.
The apparent radius of a celestial body when viewed as a disk from Earth.

semidiameter

(ˌsɛmɪdaɪˈæmɪtə)
n
the apparent radius of a star or other celestial body when viewed from Earth

sem•i•di•am•e•ter

(ˌsɛm i daɪˈæm ɪ tər, ˌsɛm aɪ-)

n.
half of a diameter.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.semidiameter - the apparent radius of a celestial body when viewed as a disc from the earth
radius, r - the length of a line segment between the center and circumference of a circle or sphere
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References in periodicals archive ?
Nanotechnology--RS provides determination of nanocrystal, chirality, semidiameters in nanomaterials.
Among its features was a gem of an introduction in which Dee makes the startling observation that "the distance of the starrie skie is from us, in Semidiameters of the Earth 20081 1/2.